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strutils.h

00001 /***************************************************************************
00002     copyright            : (C) 2002-2005 by Stefano Barbato
00003     email                : stefano@codesink.org
00004 
00005     $Id: strutils.h,v 1.8 2005/02/23 10:26:14 tat Exp $
00006  ***************************************************************************/
00007 
00008 /***************************************************************************
00009  *                                                                         *
00010  *   This program is free software; you can redistribute it and/or modify  *
00011  *   it under the terms of the GNU General Public License as published by  *
00012  *   the Free Software Foundation; either version 2 of the License, or     *
00013  *   (at your option) any later version.                                   *
00014  *                                                                         *
00015  ***************************************************************************/
00016 #ifndef _MIMETIC_STRINGUTILS_H_
00017 #define _MIMETIC_STRINGUTILS_H_
00018 #include <string>
00019 #include <iostream>
00020 #include <algorithm>
00021 
00022 namespace mimetic
00023 {
00024 
00025 extern const std::string nullstring;
00026 
00027 struct ichar_traits : public std::char_traits<char>
00028 {
00029     static bool eq (const char_type & c1, const char_type& c2)
00030     {    return (toupper(c1) == toupper(c2));    }
00031     static bool ne (const char_type& c1, const char_type& c2)
00032     {    return (toupper(c1) != toupper(c2));    }
00033     static bool lt (const char_type& c1, const char_type& c2)
00034     {    return (toupper(c1) < toupper(c2));    }
00035     static int compare (const char_type* s1, const char_type* s2, size_t n)
00036     {
00037         for(size_t i=0; i < n; ++i)
00038             if(toupper(s1[i]) != toupper(s2[i]))
00039                 return (toupper(s1[i]) < toupper(s2[i])) ?-1: 1;
00040         return 0;
00041     }
00042     static const char* find( const char* s, int n, char a ) 
00043     {
00044         while( n-- > 0 && tolower(*s) != tolower(a) ) 
00045                          ++s;
00046         return s;
00047     }
00048 };
00049 
00050 //typedef std::istring <char, ichar_traits> istring;
00051 using std::string;
00052 
00053 struct istring: public string
00054 {
00055     istring()
00056     {}
00057     //typedef std::string::allocator_type allocator_type;
00058     istring(const std::string& right)
00059     : string(right)
00060     {}
00061     explicit istring(const allocator_type& al)
00062     : string(al)
00063     {}
00064     istring(const istring& right)
00065     : string(right)
00066     {}
00067     istring(const istring& right, size_type roff, size_type count = npos)
00068     : string(right, roff, count)
00069     {}
00070     istring(const istring& right, size_type roff, size_type count, 
00071         const allocator_type& al)
00072     : string(right, roff, count, al)
00073     {}
00074     istring(const value_type *ptr, size_type count)
00075     : string(ptr, count)
00076     {}
00077     istring(const value_type *ptr, size_type count,const allocator_type& al)
00078     : string(ptr, count, al)
00079     {}
00080     istring(const value_type *ptr)
00081     : string(ptr)
00082     {}
00083     istring(const value_type *ptr,const allocator_type& al)
00084     : string(ptr, al)
00085     {}
00086     istring(size_type count, value_type ch)
00087     : string(count,ch)
00088     {}
00089     istring(size_type count, value_type ch,const allocator_type& al)
00090     : string(count,ch,al)
00091     {}
00092     template <class InIt>
00093     istring(InIt first, InIt last)
00094     : string(first, last)
00095     {}
00096     template <class InIt>
00097     istring(InIt first, InIt last,const allocator_type& al)
00098     : string(first, last, al)
00099     {}
00100 };
00101 
00102 
00103 inline bool operator==(const istring& is, const std::string& s)
00104 {
00105     return (0 == ichar_traits::compare(is.c_str(),s.c_str(),
00106             std::max(is.length(),s.length())) );
00107 }
00108 
00109 inline bool operator!=(const istring& is, const std::string& s)
00110 {
00111     return (0 != ichar_traits::compare(is.c_str(),s.c_str(),
00112             std::max(is.length(),s.length())) );
00113 }
00114 
00115 inline bool operator!=(const istring& is, const char* str)
00116 {
00117     return (0 != ichar_traits::compare(is.c_str(),str,
00118             std::max(is.length(),::strlen(str))) );
00119 }
00120 
00121 inline bool operator==(const istring& is, const char* str)
00122 {
00123     return (0 == ichar_traits::compare(is.c_str(),str,
00124             std::max(is.length(),::strlen(str))) );
00125 }
00126 
00127 inline std::string dquoted(const std::string& s)
00128 {    
00129     return "\"" + s + "\"";
00130 }
00131 
00132 inline std::string parenthed(const std::string& s)
00133 {    
00134     return "(" + s + ")";
00135 }
00136 
00137 /// removes double quotes
00138 inline std::string remove_dquote(const std::string& s)
00139 {
00140     int len = s.length();
00141     if( len < 2)
00142         return s;
00143     if(s[0] == '"' && s[len-1] == '"')
00144         return std::string(s, 1, len-2);
00145     return s;
00146 }
00147 
00148 /**
00149  * returns the \e canonical representation of \p s (see RFC822)
00150  * if \p no_ws is true removes all blanks from the resulting string
00151  */
00152 std::string canonical(const std::string& s, bool no_ws = false);
00153 
00154 /// removes leading and trailing blanks
00155 inline std::string remove_external_blanks(const std::string& in)
00156 {
00157     if(!in.length())
00158         return in;
00159     std::string s = in;
00160     int beg = 0, end = s.length();
00161     for(; beg < end; ++beg)
00162         if(s[beg] != ' ' && s[beg] != '\t')
00163             break;
00164     end = s.length() - 1;
00165     for(; end > beg; --end)
00166         if(s[end] != ' ' && s[end] != '\t')
00167             break;
00168     s.assign(std::string(s, beg, end - beg + 1));
00169     return s;
00170 }
00171 
00172 }
00173 
00174 #endif
00175